cgb2955
BALLC_4B_IMG_2129_lightened (1 of 1)
This image is an iteration of a third test of additive color. This test attempts to determine whether luminance provided to a surface by a light source can affect additive color. Before this test, I tested primary colors one at a time. This image shows three secondary colors as they are created from the primary colors, with two flashes of illumination per primary color.
Setup: A large rectangle of black velvet was laid flat on the floor, and a rectangle (sheet) of white ("snowcap") cardstock was laid on top of the velvet. The camera shutter was opened. An external flash unit with a blue gel was fired twice from a height of approximately 30 inches. The sheet was moved clockwise. The flash was fired again twice, this time with a red gel. The sheet was moved clockwise. The flash was fired twice with a green gel. The camera shutter was closed.
The three secondary colors are visible at the overlaps of pairs of the three primary colors. The color white is seen at the overlap of all three primary colors.. These colors are brighter than in a test with one flash per color. (This particular image has been lightened in Lightroom by approximately 2 stops.)
The gels used were Rogue Lighting Filters Just Blue (f-stop loss 2 1/3), Bright Red (f-stop loss 3 1/2)., and Moss Green (f-stop loss 1 1/2).. The flash unit used was a Yongnuo YN-568EX II 4-Channel TTL Flash Speedlite for Canon E-TTL/E-TTL II Cameras. A flash unit was used to provide more control over the amount of light to be supplied. Its output is more measurable and repeatable than a flashlight timed by a human, and the illumination is uniform across the objects.
BALLC_4B_IMG_2129_lightened (1 of 1)
This image is an iteration of a third test of additive color. This test attempts to determine whether luminance provided to a surface by a light source can affect additive color. Before this test, I tested primary colors one at a time. This image shows three secondary colors as they are created from the primary colors, with two flashes of illumination per primary color.
Setup: A large rectangle of black velvet was laid flat on the floor, and a rectangle (sheet) of white ("snowcap") cardstock was laid on top of the velvet. The camera shutter was opened. An external flash unit with a blue gel was fired twice from a height of approximately 30 inches. The sheet was moved clockwise. The flash was fired again twice, this time with a red gel. The sheet was moved clockwise. The flash was fired twice with a green gel. The camera shutter was closed.
The three secondary colors are visible at the overlaps of pairs of the three primary colors. The color white is seen at the overlap of all three primary colors.. These colors are brighter than in a test with one flash per color. (This particular image has been lightened in Lightroom by approximately 2 stops.)
The gels used were Rogue Lighting Filters Just Blue (f-stop loss 2 1/3), Bright Red (f-stop loss 3 1/2)., and Moss Green (f-stop loss 1 1/2).. The flash unit used was a Yongnuo YN-568EX II 4-Channel TTL Flash Speedlite for Canon E-TTL/E-TTL II Cameras. A flash unit was used to provide more control over the amount of light to be supplied. Its output is more measurable and repeatable than a flashlight timed by a human, and the illumination is uniform across the objects.